Hello
In server (centos7 + plesk 17.5 updated), we have an very strange issue.
Server have 6 public ips on em1:
- 3 ips that are in an /29 (YYY ips)
- 3 ips that are in an /28 (XXX ips)
we configure it by plesk directly, only first one have an gateway in fisical file. All ips works fine, but sometime, one of them stop working... and some time work again after a few hours! in other case, with an ifdown / iftop, problem solve, but when failed, of course, all domain associated to this ip go down (one of /29). We have try to change ip and associated all domain that associated to previous ip to this new ip, and same problem after few hours.
The datacenter say us that there no problem on networks and switch...
we are a few confused, I have seem some similar item :
Issue - Problem adding second IPv6 address
but have not obtain an real solution for now.
The very strange things, is that all other 5 ips (and domain associated with these ip) still working without problem (include ips that are in same /29!)
No firewall activated, no iptables problem, no fail2ban, no selinux... We don't understand what block/disable this ip :-(
em1: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet XXX.XXX.XXX.105 netmask 255.255.255.240 broadcast XXX.XXX.XXX.111
inet6 fe80::862b:2bff:fe51:a749 prefixlen 64 scopeid 0x20<link>
ether 84:2b:2b:51:a7:49 txqueuelen 1000 (Ethernet)
RX packets 234609714 bytes 131387799417 (122.3 GiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 271765587 bytes 263121693820 (245.0 GiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
em1:1: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet YYY.YYY.YYY.132 netmask 255.255.255.248 broadcast YYY.YYY.YYY.135
ether 84:2b:2b:51:a7:49 txqueuelen 1000 (Ethernet)
em1:2: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet XXX.XXX.XXX.103 netmask 255.255.255.240 broadcast 0.0.0.0
ether 84:2b:2b:51:a7:49 txqueuelen 1000 (Ethernet)
em1:3: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet YYY.YYY.YYY.134 netmask 255.255.255.248 broadcast 0.0.0.0
ether 84:2b:2b:51:a7:49 txqueuelen 1000 (Ethernet)
em1:4: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet XXX.XXX.XXX.110 netmask 255.255.255.240 broadcast 0.0.0.0
ether 84:2b:2b:51:a7:49 txqueuelen 1000 (Ethernet)
em1:5: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet YYY.YYY.YYY.133 netmask 255.255.255.248 broadcast YYY.YYY.YYY.135
ether 84:2b:2b:51:a7:49 txqueuelen 1000 (Ethernet)
em2: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 192.168.0.154 netmask 255.255.255.0 broadcast 192.168.0.255
inet6 fe80::862b:2bff:fe51:a74a prefixlen 64 scopeid 0x20<link>
ether 84:2b:2b:51:a7:4a txqueuelen 1000 (Ethernet)
RX packets 23762725 bytes 2779300854 (2.5 GiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 113263517 bytes 171328023927 (159.5 GiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
lo: flags=73<UP,LOOPBACK,RUNNING> mtu 65536
inet 127.0.0.1 netmask 255.0.0.0
inet6 ::1 prefixlen 128 scopeid 0x10<host>
loop txqueuelen 1 (Local Loopback)
RX packets 194427436 bytes 176561336736 (164.4 GiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 194427436 bytes 176561336736 (164.4 GiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
I don't know if it can be an sysctl problem...
Hope someone can give us some test to do to find problem.
Thanks a lot.
In server (centos7 + plesk 17.5 updated), we have an very strange issue.
Server have 6 public ips on em1:
- 3 ips that are in an /29 (YYY ips)
- 3 ips that are in an /28 (XXX ips)
we configure it by plesk directly, only first one have an gateway in fisical file. All ips works fine, but sometime, one of them stop working... and some time work again after a few hours! in other case, with an ifdown / iftop, problem solve, but when failed, of course, all domain associated to this ip go down (one of /29). We have try to change ip and associated all domain that associated to previous ip to this new ip, and same problem after few hours.
The datacenter say us that there no problem on networks and switch...
we are a few confused, I have seem some similar item :
Issue - Problem adding second IPv6 address
but have not obtain an real solution for now.
The very strange things, is that all other 5 ips (and domain associated with these ip) still working without problem (include ips that are in same /29!)
No firewall activated, no iptables problem, no fail2ban, no selinux... We don't understand what block/disable this ip :-(
em1: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet XXX.XXX.XXX.105 netmask 255.255.255.240 broadcast XXX.XXX.XXX.111
inet6 fe80::862b:2bff:fe51:a749 prefixlen 64 scopeid 0x20<link>
ether 84:2b:2b:51:a7:49 txqueuelen 1000 (Ethernet)
RX packets 234609714 bytes 131387799417 (122.3 GiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 271765587 bytes 263121693820 (245.0 GiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
em1:1: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet YYY.YYY.YYY.132 netmask 255.255.255.248 broadcast YYY.YYY.YYY.135
ether 84:2b:2b:51:a7:49 txqueuelen 1000 (Ethernet)
em1:2: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet XXX.XXX.XXX.103 netmask 255.255.255.240 broadcast 0.0.0.0
ether 84:2b:2b:51:a7:49 txqueuelen 1000 (Ethernet)
em1:3: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet YYY.YYY.YYY.134 netmask 255.255.255.248 broadcast 0.0.0.0
ether 84:2b:2b:51:a7:49 txqueuelen 1000 (Ethernet)
em1:4: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet XXX.XXX.XXX.110 netmask 255.255.255.240 broadcast 0.0.0.0
ether 84:2b:2b:51:a7:49 txqueuelen 1000 (Ethernet)
em1:5: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet YYY.YYY.YYY.133 netmask 255.255.255.248 broadcast YYY.YYY.YYY.135
ether 84:2b:2b:51:a7:49 txqueuelen 1000 (Ethernet)
em2: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 192.168.0.154 netmask 255.255.255.0 broadcast 192.168.0.255
inet6 fe80::862b:2bff:fe51:a74a prefixlen 64 scopeid 0x20<link>
ether 84:2b:2b:51:a7:4a txqueuelen 1000 (Ethernet)
RX packets 23762725 bytes 2779300854 (2.5 GiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 113263517 bytes 171328023927 (159.5 GiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
lo: flags=73<UP,LOOPBACK,RUNNING> mtu 65536
inet 127.0.0.1 netmask 255.0.0.0
inet6 ::1 prefixlen 128 scopeid 0x10<host>
loop txqueuelen 1 (Local Loopback)
RX packets 194427436 bytes 176561336736 (164.4 GiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 194427436 bytes 176561336736 (164.4 GiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
I don't know if it can be an sysctl problem...
Hope someone can give us some test to do to find problem.
Thanks a lot.